EP2000835B1 - Verbreitungsstruktur für elektromagnetische Wellen - Google Patents

Verbreitungsstruktur für elektromagnetische Wellen Download PDF

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Publication number
EP2000835B1
EP2000835B1 EP08251051A EP08251051A EP2000835B1 EP 2000835 B1 EP2000835 B1 EP 2000835B1 EP 08251051 A EP08251051 A EP 08251051A EP 08251051 A EP08251051 A EP 08251051A EP 2000835 B1 EP2000835 B1 EP 2000835B1
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Prior art keywords
wave
electromagnetic wave
propagating
main body
wavelength
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French (fr)
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EP2000835A1 (de
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Kuan-Ren Chen
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National Cheng Kung University NCKU
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National Cheng Kung University NCKU
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B6/122—Basic optical elements, e.g. light-guiding paths
    • G02B6/1226—Basic optical elements, e.g. light-guiding paths involving surface plasmon interaction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y20/00—Nanooptics, e.g. quantum optics or photonic crystals
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/008—Surface plasmon devices
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings

Definitions

  • the invention relates to an electromagnetic wave propagating structure, more particularly to an electromagnetic wave propagating structure that surpasses diffraction limit and that enhances resolution and precision of optical systems which incorporate the electromagnetic wave propagating structure.
  • Electromagnetic wave technology is one of the most widely used basic technologies in high-technological industries such as medical examination, precision measurement, semiconductor industry, etc. Therefore, the search for ways to enhance the resolution and precision of optical technology is what both the academic and industrial communities are striving for.
  • the behavior of light is limited by the diffraction limit, which restricts the minimum value of the product of angular divergence (sine of diffraction angle (sin ⁇ ) ) and a width of light beam (2w).
  • the achievable highest resolution for a focused light spot in optical systems is approximately 0.61 times the wavelength of the incident light beam (half of the wavelength in 1-D).
  • an object of the present invention is to provide an electromagnetic wave propagating structure that is capable of enhancing resolution and precision in optical systems.
  • EP-A-1672409 discloses an electromagnetic wave-propagating structure including the features of the precharacterising portion of claim 1, appended hereto.
  • US 2005/161589 discloses a nano-optic device comprising a plurality of subwavelength apertures in a metal film or between metal islands. The device is adapted to shape a radiation beam transmitted therethrough.
  • WO 03/016781A discloses methods and apparatus for producing small, bright nanometric light sources from apertures that are smaller than the wavelength of the emitted light. Light is directed at the surface layer of metal onto a light barrier structure that includes one or more apertures, each of which directs a small spot of light onto a target.
  • an electromagnetic wave propagating structure as defined in claim 1 appended hereto.
  • a method for focusing an electromagnetic wave that propagates from a wave emanating block in a wave-propagating direction (y) into a light spot at a wave receiving block the method as defined in claim 11 appended hereto.
  • the first example of an electromagnetic wave propagating structure is adapted to allow propagation of an electromagnetic wave therethrough. Due to the universality of the Maxwell equations, the electromagnetic wave propagating structure of the present invention is universally adaptable for electromagnetic waves having various wavelengths and frequencies, which include visible light, non-visible light, etc.
  • the electromagnetic wave propagating structure includes a main body 1 formed with two wave-propagating channels 2 that are adapted to change propagating direction and energy distribution of an electromagnetic wave once the electromagnetic wave propagates therethrough.
  • the main body 1 has surfaces capable of blocking propagation of the electromagnetic wave, and includes an incident side 11 and an exit side 12 opposite to the incident side 11 in a wave-propagating direction (y).
  • the two wave-propagating channels 2 are formed spacedly in the main body 1 therethrough.
  • Each of the wave-propagating channels 2 extends from the incident side 11 to the exit side 12, and has an incident opening 21 at the incident side 11, an exit opening 22 at the exit side 12, and an inner portion 23 extending between the incident opening 21 and the exit opening 22.
  • the inner portion 23 of each of the wave-propagating channels 2 has an inner dimension that is not larger than half of a wavelength ( ⁇ ) of the electromagnetic wave that is to be propagated therethrough.
  • the distance between the two wave-propagating channels 2 is not larger than the wavelength ( ⁇ ) of the electromagnetic wave that is to be propagated therethrough.
  • each of the wave-propagating channels 2 is defined by a channel surface made from a material that enhances transmission of electromagnetic waves.
  • the channel surfaces of the wave-propagating channels 2 are metallic.
  • the effects achieved by the electromagnetic wave propagating structure were verified through simulations using the finite-difference time-domain (FDTD) method.
  • the main body 1 which is made from a dispersive material such as a silver film or other materials that react strongly to electromagnetic waves, was modeled by the auxiliary difference equation method with Drude poles (which is the representation of the media of Drude model). Further, phasor polarized current was calculated in the simulations.
  • the relationship between the electromagnetic wave propagating structure of the present invention and the behavior of the electromagnetic wave to be propagated through the electromagnetic wave propagating structure was verified by the simulation results that will be presented hereinbelow. Furthermore, the resultant focused light spot serves to verify the effects achieved by the electromagnetic wave propagating structure of the present invention.
  • the simulation system is 2-dimensional, and is represented by a grid system having 600x600 cells of Yee space lattice with a unit cell length of 4nm.
  • Each cell of the grid system is represented by an index (I x , I y ), where (I x ) and (I y ) respectively correspond to cell location in the first direction (x) and the wave-propagating direction (y) that are orthogonal to each other.
  • the wave-propagating direction (y) is also referred interchangeably as the second direction (y) in this disclosure.
  • (I x ) and (I y ) both have values that range from 1 to 600.
  • the simulation system is also represented by a coordinate system that corresponds to the real dimensions of the grid system, which is 2.4 ⁇ m by 2.4 ⁇ m.
  • the inner dimension (w1) of the inner portion 23 of each of the wave-propagating channels 2 is 80nm (i. e.
  • channel width in°the first direction (x) is 80nm
  • distance (d1) in the first direction (x) between the two wave-propagating channels 2 is 240nm.
  • the electric field and the magnetic field are polarized respectively in the first direction (x) and a third direction (z) orthogonal to both the first direction (x) and the second direction (y), and are normalized as unity.
  • Both boundaries for the first direction (x) of the simulation system at the non-negative portion in the second direction (y) of the coordinate system are set to be periodic in order to minimize numerical reflection and errors, while all other boundaries are set as Perfectly Matched Layer Absorbing Boundary Conditions.
  • the time is normalized to the period of the electromagnetic wave, and the time step (dt) in the simulation is 0.004.
  • the magnetic fields in the third direction (z), also referred to as the z-direction magnetic fields (H z ), exiting the two wave-propagating channels 2 overlap at a central portion corresponding to a central axis of the main body 1, i.e., corresponding to (C x ) of approximately 0.
  • the electric fields in the wave-propagating direction (y), also referred to as the y-direction electric fields (Ey) exiting the two wave-propagating channels 2 cancel out at the central portion, and the energy thereof is converted into the z-direction magnetic field (H z ) and the electric field in the first direction (x), also referred to as the x-direction electric field (E x ).
  • This phenomenon is one of the sub-wavelength antenna effects.
  • the excitation of the surface currents and electromagnetic wave at the incident side 11 of the main body 1 and the coupling of the electromagnetic wave with the two wave-propagating channels 2 result in surface plasma movement and surface plasmon.
  • the electromagnetic wave when traveling through each of the wave-propagating channels 2, polarizes surfaces defining the inner portion 23 of the corresponding one of the channels 2 such that the resultant polarized charges and current flow downward along with the electromagnetic wave toward the exit side 12 of the main body 1.
  • the flowing polarized charges and current produce additional magnetic field in the third direction (z), i.e., (H z ), as a result of the sub-wavelength antenna effects.
  • the z-direction magnetic field (H z ) is focused downwardly of the exit side 12 with the main body 1 as the reference, at which time the amplitude of the z-direction magnetic field (H z ) is 0.757.
  • the propagation and focusing of the electromagnetic wave can also be verified by Poynting vectors (S1, S2) of the electric field and the magnetic field.
  • the x-direction Poynting vector (S1) and the field energy flow toward the central portion of the main body 1.
  • the y-direction Poynting vector (S2) and the field energy are focused downwardly of the exit side 12 of the main body 1 and continue to propagate downward and outward afterwards, indicating that the electromagnetic wave is a travelling electromagnetic wave.
  • the present invention utilizing recent scientific advancements, surpasses the conventional wave theory, which indicates that the light cannot be transmitted through a sub-wavelength slit.
  • the excitation of surface charge movement or a charge density wave on a metallic surface enhance the transmission of the electromagnetic wave.
  • focusing of the electromagnetic wave into a light spot smaller than half of the wavelength of the electromagnetic wave is achieved by utilizing the sub-limit wave functions within the wave-propagating channels 2 of the innovative electromagnetic wave propagating structure.
  • the wave function across the wave-propagating channels 2 is close to a constant and drops sharply on the surface of the main body 1.
  • the second example of an electromagnetic wave propagating structure differs from the first example in that the main body 1a of the second example is further formed with at least one groove 13 at the exit side 12a.
  • the groove 13 has an inner dimension that is not larger than half of the wavelength of the electromagnetic wave that is to be propagated through the wave-propagating channels 2, and is spaced apart from an adjacent one of the wave-propagating channels 2 by a distance not greater than the wavelength of the electromagnetic wave.
  • a "pushing", “squeezing” or “compressing” phenomenon occurs in the focused light spot formed from the electromagnetic wave that propagates through the wave-propagating channels 2 of the second example such that the size of the focused light spot is diminished once again, and such that changes occur in the propagating direction and energy distribution of the electromagnetic wave downwardly of the exit side 12a of the main body 1a.
  • the main body 1a is formed with one groove 13 for illustration purposes.
  • the groove 13 has a groove depth (t2) in the wave-propagating direction (y) and a groove width (w2) in the first direction (x); both set to be 80nm.
  • the distance (d2) between the right-hand one of the wave-propagating channels 2 and the groove 13 in the first direction (x) is set to be 120nm.
  • the z-direction magnetic field (Hz) is focused downwardly of the exit side 12a into a light spot that has an energy averaged spot size of 0.328 ⁇ (a FWHM spot size of 0.378 ⁇ ) and an amplitude of 0.791, and that is smaller than half of the wavelength of the electromagnetic wave.
  • the light spot is asymmetrical due to the "squeezed" or "compressed” phenomenon.
  • the third example of an electromagnetic wave propagating structure differs from the second example in that the main body 1b of the third example is further formed with two of the grooves 13 at the exit side 12b.
  • the grooves 13 are symmetrically disposed about a central axis of the main body 1b, and are disposed to interpose the wave-propagating channels 2 therebetween.
  • the grooves 13 serve to squeeze the focused light spot.
  • the fourth example of an electromagnetic wave propagating structure differs from the third example in that the main body 1c of the fourth example is further formed with a plurality of the grooves 13 at the exit side 12c.
  • the grooves 13 are periodically spaced apart from each other, and the distance between each adjacent pair of the grooves 13 is not larger than the wavelength of the electromagnetic wave.
  • the incident side 11 is formed with at least one groove
  • the physical behavior of the electromagnetic wave coupling into and after propagating through the wave-propagating channels 2. will change. An example is provided hereinbelow.
  • the fifth example of an electromagnetic wave propagating structure differs from the first example in that the main body 1d of the fifth example is further formed with a plurality of periodically spaced apart grooves 13 at the incident side 11d.
  • Each of the grooves 13 has an inner dimension that is not larger than half of the wavelength of the electromagnetic wave.
  • the distance between each adjacent pair of the grooves 13 is not larger than the wavelength of the electromagnetic wave.
  • two of the grooves 13 are respectively disposed in spatial communication with the wave-propagating channels 2d such that the incident opening 21d of each of the wave-propagating channels 2d at the incident side 11d has an inner dimension not smaller than that of the inner portion 23 of each of the wave-propagating channels 2d between the incident opening 21d and the exit opening 22.
  • the fifth example also results in focusing of the electromagnetic wave into a light spot having a size smaller than half of the wavelength of the electromagnetic wave.
  • the electromagnetic wave propagating structure of the examples disclosed hereinabove can also involve the use of a dielectric material.
  • the fifth example of an electromagnetic wave propagating structure differs from the first example in the inclusion of a light-transmissible dielectric layer 3 disposed on the incident side 11 of the main body 1 for supporting the main body 1, for generating a waveguide effect, and for changing the propagating behavior of the electromagnetic wave that is to be propagated through the electromagnetic wave propagating structure.
  • the light-transmissible dielectric layer 3 is made from glass.
  • the sixth preferred embodiment also achieves the effect of focusing of the electromagnetic wave into a light spot having a size smaller than half of the wavelength of the electromagnetic wave.
  • the first preferred embodiment of an electromagnetic wave propagating structure according to the present invention differs from the first preferred embodiment in that the exit opening 22e of each of the wave-propagating channels 2e is shaped asymmetrically about the central line of the inner portion 23 of the corresponding one of the wave-propagating channels 2e.
  • the effect is that bending of the electromagnetic wave occurs after exiting the two wave-propagating channels 2e via the exit openings 22e, in which the electromagnetic wave, while maintaining a substantially unchanged energy distribution near the central axis of the main body 1e, continues to propagate downwardly away from the exit side 12e of the main body 1e toward the central axis of the main body 1e and is eventually focused into a light spot.
  • the z-direction magnetic field (H z ) is focused into a light spot (with an amplitude of 1.30) having an energy averaged size of 0.341 ⁇ (or a FWHM spot size of 0.364 ⁇ ), which is smaller than half of the wavelength of the electromagnetic wave.
  • the seventh example of an electromagnetic wave propagating structure differs from the first embodiment in that the exit openings 22f of the two wave-propagating channels 2f are disposed in direct spatial communication with each other in the first direction (x).
  • the eighth preferred embodiment also achieves a focused spot size of smaller than half of the wavelength of the electromagnetic wave, and that the electromagnetic wave bends after exiting the two wave-propagating channels 2f via the exit openings 22f prior to focusing into the light spot. Furthermore, after propagating toward the central axis of the main body 1f and being focused into the light spot, the electromagnetic wave continues to propagate with a high intensity.
  • the eighth example of an electromagnetic wave propagating structure differs from the seventh example in that the main body 1g is further formed with a groove 13 on the exit side 12g.
  • the groove 13 has an inner dimension not greater than half of the wavelength of the electromagnetic wave.
  • the eighth example was verified to achieve the effect of focusing of the electromagnetic wave into a light spot having a size smaller than half of the wavelength of the electromagneticwave.
  • the light spot is asymmetrical due to the "squeezed” or “compressed” phenomenon.
  • the ninth example of an electromagnetic wave propagating structure differs from the eighth example in that the main body 1h of the ninth example is formed with two of the grooves 13 at the exit side 12h.
  • the grooves 13 are symmetrically disposed about a central axis of the main body 1h, and are disposed to interpose the wave-propagating channels 2f therebetween.
  • the grooves 13 serve to compress the focused light spot.
  • the ninth example also achieves the effect of focusing of the electromagnetic wave into a light spot having a size smaller than half of the wavelength of the electromagnetic wave.
  • the tenth example of an electromagnetic wave propagating structure differs from the seventh example in that the main body 1i of the tenth example is formed with a plurality of the grooves 13 at the exit side 12i.
  • the grooves 13 are periodically spaced apart from each other, and the distance between each adjacent pair of the grooves 13 is not larger than the wavelength of the electromagnetic wave.
  • the incident side is formed with at least one groove
  • the physical behavior of the electromagnetic wave coupling into and after propagating through the wave-propagating channels will change.
  • An example is provided hereinbelow.
  • the eleventh example of an electromagnetic wave propagating structure differs from the seventh example in that the main body 1j of the eleventh example is further formed with a plurality of periodically spaced apart grooves 13 at the incident side 11j .
  • Each of the grooves 13 has an inner dimension that is not larger than half of the wavelength of the electromagnetic wave.
  • the distance between each adjacent pair of the grooves 13 is not larger than the wavelength of the electromagnetic wave.
  • the eleventh example was verified to achieve the effect of focusing of the electromagnetic wave into a light spot having a size smaller than half of the wavelength of the electromagnetic wave.
  • the electromagnetic wave propagating structure of the first preferred embodiment and the seventh to eleventh example disclosed hereinabove can also involve the use of a dielectric material.
  • the twelfth example of an electromagnetic wave propagating structure according to the present invention differs from the seventh example in the inclusion of a light-transmissible dielectric layer 3 disposed on the incident side 11 of the main body 1f for supporting the main body 1f, for generating the waveguide effect, and for changing the propagating behavior of the electromagnetic wave that is to be propagated through the electromagnetic wave propagating structure.
  • the light-transmissible dielectric layer 3 is made from glass. It was verified through simulation that the twelfth example also achieves focusing of the electromagnetic wave into a light spot having a size smaller than half of the wavelength of the electromagnetic wave.
  • the thirteenth example of an electromagnetic wave propagating structure differs from the first example in that the central lines of the wave-propagating channels 2p of the thirteenth example extend toward the central axis of the main body 1p from the incident side 11 toward the exit side 12 (i.e., the distance between each of the central lines and the central axis decreases gradually from the incident side 11 toward the exit side 12).
  • the simulation system is also represented by a grid system having 600x600 cells of Yee space lattice with a unit cell length of 4nm.
  • the main body 1p is set to have a thickness (t1 p ) in the wave-propagating direction (y) of 160nm (i.e., a distance between the incident side 11 and the exit side 12 of the main body 1p in the wave-propagating direction (y) is 160nm).
  • the inner dimension (w1) of the inner portion 23 of each of the wave-propagating channels 2p is 80nm (i.e., channel width in the first direction (x) is 80nm).
  • the distance (d1p) in the first direction (x) between the two wave-propagating channels 2p at the incident side 11 is 240nm
  • the distance (d1p') in the first direction (x) between the two wave-propagating channels 2p at the exit side 12 is 200nm.
  • Other simulation, parameters are identical to those disclosed hereinabove for the first example.
  • the z-direction magnetic fields (H z ) are focused into a light spot (with an amplitude of 1.159) having an energy averaged size of 0.376 ⁇ (or a FWHM spot size of 0. 418 ⁇ ), which is smaller than half of the wavelength of the electromagnetic wave.
  • the fourteenth example of an electromagnetic wave propagating structure differs from the thirteenth example in that the main body 1q of the fourteenth example is further formed with at least one groove 13 at the exit side 12q.
  • the groove 13 has an inner dimension that is not larger than half of the wavelength of the electromagnetic wave that is to be propagated through the wave-propagating channels 2p, and is spaced apart from an adjacent one of the wave-propagating channels 2 by a distance not greater than the wavelength of the electromagnetic wave.
  • the "pushing", “squeezing” or “compressing” phenomenon occurs in the focused light spot formed from the electromagnetic wave that propagates through the wave-propagating channels 2p of the fourteenth example such that the size of the focused light spot is diminished once again, and such that changes occur in the propagating direction and energy distribution of the electromagnetic wave downwardly of the exit side 12q of the main body 1q.
  • the main body 1q is formed with one groove 13 for illustration purposes.
  • the fourteenth example also achieves the effect of focusing of the electromagnetic wave into a light spot having a size smaller than half of the wavelength of the electromagnetic wave.
  • the light spot is asymmetrical due to the "squeezed” or “compressed” phenomenon.
  • the fifteenth example of an electromagnetic wave propagating structure according to the present invention differs from the thirteenth example in that the main body 1r of the fifteenth example is further formed with two of the grooves 13 at the exit side 12r.
  • the grooves 13 are symmetrically disposed about a central axis of the main body 1r, and are disposed to interpose the wave-propagating channels 2p therebetween.
  • the grooves 13 serve to squeeze the focused light spot.
  • the sixteenth example of an electromagnetic wave propagating structure differs from the thirteenth example in that the main body 1s of the sixteenth example is further formed with a plurality of the grooves 13 at the exit side 12s.
  • the grooves 13 are periodically spaced apart from each other, and the distance between each adjacent pair of the grooves 13 is not larger than the wavelength of the electromagnetic wave.
  • the incident side is formed with at least one groove
  • the physical behavior of the electromagnetic wave coupling into and after propagating through the wave-propagating channels will change.
  • An example is provided hereinbelow.
  • the seventeenth example of an electromagnetic wave propagating structure differs from the thirteenth example in that the main body 1t of the seventeenth example is further formed with a plurality of periodically spaced apart grooves 13 at the incident side 11t.
  • Each of the grooves 13 has an inner dimension that is not larger than half of the wavelength of the electromagnetic wave.
  • the distance between each adjacent pair of the grooves 13 is not larger than the wavelength of the electromagnetic wave.
  • two of the grooves 13 are respectively disposed in spatial communication with the wave-propagating channels 2t such that the incident opening 21t of each of the wave-propagating channels 2t at the incident side 11t has an inner dimension not smaller than that of the inner portion 23t of each of the wave-propagating channels 2t between the incident opening 21t and the exit opening 22t.
  • the seventeenth example also achieves the effect of focusing of the electromagnetic wave into a light spot having a size smaller than half of the wavelength of the electromagnetic wave.
  • the electromagnetic wave propagating structure of the thirteenth to seventeenth examples can also involve the use of a dielectric material.
  • the eighteenth example of an electromagnetic wave propagating structure differs from the thirteenth example in the inclusion of a light-transmissible dielectric layer 3 disposed on the incident side 11 of the main body 1p for supporting the main body 1p, for generating a waveguide effect, and for changing the propagating behavior of the electromagnetic wave that is to be propagated through the electromagnetic wave propagating structure.
  • the light-transmissible dielectric layer 3 is made from glass.
  • the eighteenth example also achieves the effect of focusing of the electromagnetic wave into a light spot having a size smaller than half of the wavelength of the electromagnetic wave.
  • the second preferred embodiment of an electromagnetic wave propagating structure according to the present invention differs from the first preferred embodiment in that the main body 1u of the second preferred embodiment is further formed with a plurality of periodically spaced apart grooves 13 at the exit side 12u.
  • Each of the grooves 13 has an inner dimension that is not larger than half of the wavelength of the electromagnetic wave.
  • the distance between each adjacent pair of the grooves 13 is not larger than the wavelength of the electromagnetic wave.
  • two of the grooves 13 are respectively disposed in spatial communication with the wave-propagating channels 2u such that the exit opening 22u of each of the wave-propagating channels 2u has an inner dimension that is not smaller than that of the inner portion 23u of the corresponding one of the wave-propagating channels 2u.
  • the inner portion 23u of each of the wave-propagating channels 2u has a central line that is parallel to the central axis of the main.body 1u. The central lines are equidistant from the central axis of the main body 1u in the first direction (x).
  • the exit opening 22u of each of the wave-propagating channels 2u is symmetrical about the central line of the inner portion 23u of the corresponding one of the wave-propagating channels 2u.
  • At least one of the inner dimension and depth of each of the grooves 13 and the distance between adjacent ones of the grooves 13 is set such that after the electromagnetic wave has propagated through the two wave-propagating channels 2u, the fields exiting the two wave-propagating channels 2u are superposed near the central axis of the main body 1u, and continue to propagate along the central axis while the energy distribution remains substantially unchanged during the propagation. In other words, a super-collimated beam is formed, where the angle of divergence is very close to zero.
  • the simulation system has 3000x3000 cells of Yee space lattice with a unit cell length of 4nm.
  • the electromagnetic wave has a wavelength of 633nm.
  • each of the wave-propagating channels 2u is 40nm, and the distance (d1 u ) between the two wave-propagating channels 2u is 440nm.
  • Each of the grooves 13 has a depth (t2 u ) of 80nm and a width (w2 u ) of 240nm.
  • the distance (d3 u ) between each adjacent pair of the grooves 13 is 240nm.
  • the electric field and magnetic field are polarized respectively in the first and third directions (x), (z), and are normalized as unity.
  • Both boundaries for the first direction (x) of the simulation system at an upper portion of the main body 1u about a center of the main body 1u are periodic so as to minimize numerical reflection and errors, while all other boundaries are set as Perfectly Matched Layer Absorbing Boundary Conditions.
  • the time is normalized to the period of the electromagnetic wave that is to be propagated through the wave propagating channels 2u, and the time step (dt) in the simulation is 0.004.
  • the z-direction magnetic field (H z ) continues to propagate downwardly away from the exit side 12u of the main body 1u as a super-collimated beam with a substantially fixed amplitude for a distance larger than ten times the wavelength of the electromagnetic wave.
  • the third preferred embodiment of an electromagnetic wave propagating structure according to the present invention differs from the second preferred embodiment in that both the incident side 11v and the exit side 12u of the main body 1v are formed with the grooves 13 such that the inner dimensions of both of the incident and exit openings 21v, 22u of each of the wave-propagating channels 2v are not smaller than that of the inner portion 23u of the corresponding one of the wave-propagating channels 2v.
  • the grooves 13 at the incident side 11v and the grooves 13 at the exit side 12u are symmetrically disposed about a longitudinal axis of the main body 1v in the first direction (x).
  • the electromagnetic wave continues to propagate downwardly away from the exit side 12u of the main body 1v as a super-collimated beam with substantially fixed amplitude. Furthermore, the intensity of the electromagnetic wave after propagating through the wave-propagating channels 2v of the twenty-first preferred embodiment is greater than that after propagating through the wave-propagating channels 2u of the twentieth preferred embodiment.
  • the electromagnetic wave propagating structure of the second and third preferred embodiments can also involve the use of dielectric materials.
  • the fourth preferred embodiment of an electromagnetic wave propagating structure according to the present invention further includes a light-transmissible dielectric layer 3 that is disposed on the incident side 11 of the main body 1u for supporting the main body 1u, for generating the waveguide effect, and for changing the propagating behavior of the electromagnetic wave that is to be propagated through the electromagnetic wave propagating structure.
  • the light-transmissible dielectric layer is made from glass.
  • effects similar to the twentieth preferred embodiment are achieved by the twenty-second preferred embodiment, where the electromagnetic wave continues to propagate downwardly away from the exit side 12u of the main body 1u while maintaining a fixed amplitude as a super-collimated beam after propagating through the main body 1u via the wave-propagating channels 2u.
  • each of the wave-propagating channels 2 is factors that control the divergent angle and the diffraction behavior of the electromagnetic wave that propagates through the wave-propagating channels 2.
  • the material composing the main body 1, and the presence of the dielectric layers 3 also take part in affecting the intensity variations of the electromagnetic wave during propagation through a system involving the electromagnetic wave propagating structure of the present invention. Therefore, all these factors can be adjusted and defined according to the requirements of a specific application so as to achieve the most desirable results.
  • the electromagnetic wave propagating structure of this invention is suitable for application to an electromagnetic wave propagating system that includes a wave emanating block, from which an electromagnetic wave having a wavelength is adapted to propagate in a wave-propagating direction, and a wave receiving block.
  • the electromagnetic wave propagating structure of the first through nineteenth preferred embodiments is provided between the wave emanating block and the wave receiving block, the electromagnetic wave that propagates from the wave emanating block through the electromagnetic wave propagating structure via the wave-propagating channels toward the wave receiving block is focused into a light spot having a spot size that is smaller than half of the wavelength of the electromagnetic wave.
  • the electromagnetic wave propagating structure of the twentieth through twenty-second preferred embodiments is provided between the wave emanating block and the wave receiving block, the electromagnetic wave that propagates from the wave emanating block through the electromagnetic wave propagating structure via the wave-propagating channels continues to propagate toward the wave receiving block as a super-collimated beam.
  • the electromagnetic wave propagating structure of the first through nineteenth preferred embodiments can be integrated with the wave emanating block to result in a light spot generator for focusing an electromagnetic wave into a light spot having a spot size that is smaller than half of the wavelength of the electromagnetic wave.
  • the electromagnetic wave propagating structure of the twentieth through twenty-second preferred embodiments can be integrated with the wave emanating block to result in a light beam generator for generating a super-collimated beam from an electromagnetic wave.
  • the electromagnetic wave propagating structure according to the present invention is suitable for various applications, such as in optical, semiconductor, and bio-tech industries.
  • the application of the present invention in lithography processes results in finer, more delicate dots, lines and circuits.
  • the present invention enhances the resolution and precision in optical systems, connects optical systems and electrical circuits, is applicable to sub-wavelength high resolution microscopes in biological and medical imaging industries, is applicable for more precise detection, changes and controls the structure, characteristics and dynamics of biological, chemical and physical systems, generates and reads smaller optical recording spots in optical storage industries, squeezes light into optical circuits having sizes smaller than the wavelength of the light, etc.
  • the super-collimated beam provided by the present invention is suitable for applications requiring an electromagnetic wave beam without divergence during its propagation.
  • the present invention allows the electromagnetic wave to diverge greatly after being focused, and thus is applicable where an increase of viewing angle is required, e.g., in light-emitting diodes.
  • the subtraction and addition of the sub-wavelength optical fields are applicable in optical computation and control.
  • the selectivity for various wavelengths of the electromagnetic wave allows application in filtering.
  • the present invention successfully establishes an electromagnetic wave propagating structure that is adapted to generate a high intensity sub-wavelength focused spot after an electromagnetic wave propagates therethrough, and that has an exit structure that allows the electromagnetic wave to surpass the diffraction limit so as to diminish the size of the focused spot to thereby effectively enhance the resolution and precision of optical systems that incorporate the electromagnetic wave propagating structure of this invention.
  • FDTD finite-difference time-domain

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Claims (21)

  1. Elektromagnetische Wellenverbreitungsstruktur, die für ein elektromagnetisches Wellenverbreitungssystem verwendet werden kann, das einen Wellen abgebenden Block aufweist, von dem aus sich eine elektromagnetische Welle in einer Wellenausbreitungs-Richtung (y) ausbreiten kann und das einen Empfangsblock aufweist, wobei die elektromagnetische Wellenverbreitungsstruktur folgendes umfaßt: einen Hauptkörper (1), der mit Oberflächen versehen ist, welche in der Lage sind, die Ausbreitung der elektromagnetischen Welle zu blockieren und der eine Einfallseite (11) sowie eine Austrittsseite (12) aufweist, die der Einfallsseite (11) in Wellenverbreitungs-Richtung (y) gegenüberliegt, wobei der Hauptkörper (1) mit Wellenverbreitungskanälen (2) versehen ist, die mit einem Abstand nebeneinander angeordnet sind, der nicht größer ist als die Wellenlänge der elektromagnetischen Welle, wobei ferner jeder der Wellenverbreitungskanäle (2) sich von der Einfallseite (11) und der Austrittsseite (12) erstreckt; und wobei die elektromagnetische Wellenverbreitungsstruktur in der Lage ist, bei Benutzung einer elektromagnetischen Welle zu gestatten, sich von dem Wellen abgebenden Block durch die Wellenverbreitungskanäle (2) hindurch zu bewegen und in ihnen Oberflächenplasmawellen zu erzeugen und sich in Richtung auf den Wellen aufnehmenden Block zu bewegen, um in einem Lichtspot fokussiert zu werden, dessen Spotgröße kleiner ist als die halbe Wellenlänge der elektromagnetischen Welle, dadurch gekennzeichnet, daß es genau zwei Wellenverbreitungskanäle gibt und jeder der Wellenverbreitungskanäle eine innere Abmessung hat, die nicht größer ist als die Hälfte der Wellenlänge der elektromagnetischen Welle und daß der Hauptkörper (1e) eine zentrale Achse in der Wellenverbreitungs-Richtung (y) bildet, des weiteren jeder der Wellenverbreitungskanäle (2e) eine Einfallöffnung (21) auf der Einfallseite (11) des Hauptkörpers (1e) aufweist, des weiteren eine Austrittsöffnung (22e) auf der Austrittsseite (12e) des Hauptkörpers (1e) und einen inneren Teil (23), der sich zwischen der Einfallöffnung und der Austrittsöffnung (22e) erstreckt und eine zentrale Linie bildet, die parallel zu der zentralen Achse liegt und eine innere Abmessung hat, welche nicht größer ist als diejenige der Einfallöffnung (21), wobei des weiteren die Austrittsöffnung (22e) des der Wellenverbreitungskanäle (2e) um die zentrale Linie des entsprechenden der Wellenverbreitungskanäle (2e) asymmetrisch ist, und wobei ferner die Austrittsöffnung (22e) jedes der Wellenverbreitungskanäle (12e) um die zentrale Linie erste und zweite Hälften aufweist, wobei die erste Hälfte nahe an der zentralen Achse des Hauptkörpers (1e) liegt, während die zweite Hälfte von der zentralen Achse entfernt liegt, und wobei schließlich die erste Hälfte eine Abmessung aufweist, die größer ist als diejenige der zweiten Hälfte.
  2. Elektromagnetische Wellenverbreitungsstruktur nach Anspruch 1, dadurch gekennzeichnet, daß die Austrittsöffnungen (22f) der Wellenverbreitungskanäle (2f) in direkter räumlicher Verbindung zueinander stehen.
  3. Elektromagnetische Wellenverbreitungsstruktur nach Anspruch 1, dadurch gekennzeichnet, daß der Hauptkörper (1) eine zentrale Achse in Wellenverbreitungs-Richtung (y) bildet, und daß jeder der Wellenverbreitungskanäle (2) eine zentrale Linie aufweist, die sich in Richtung auf die zentrale Achse von der Einfallsseite (11) zu der Austrittsseite (12) erstreckt.
  4. Elektromagnetische Wellenverbreitungsstruktur nach Anspruch 1, dadurch gekennzeichnet, daß der Hauptkörper (1a) des weiteren mit wenigstens einer Nut (13) in der Austrittsseite (12a) versehen ist, die eine innere Abmessung aufweist, welche nicht größer ist als die halbe Wellenlänge der elektromagnetischen Welle und die neben einem der Wellenverbreitungskanäle (2) getrennt angeordnet ist, und zwar in einem Abstand, der nicht größer ist als die Wellenlänge der elektromagnetischen Welle.
  5. Elektromagnetische Wellenverbreitungsstruktur nach Anspruch 1, dadurch gekennzeichnet, daß der Hauptkörper (1c) des weiteren mit mehreren Nuten (13) in der Austrittsseite (12c) versehen ist, wobei jede Nut (13) eine Innenabmessung aufweist, die größer ist als die halbe Wellenlänge der elektromagnetischen Welle, und daß nebeneinander liegende Nuten (13) voneinander einen Abstand aufweisen, der nicht größer ist als die Wellenlänge der elektromagnetischen Welle.
  6. Elektromagnetische Wellenverbreitungsstruktur nach einem der Ansprüche 1, dadurch gekennzeichnet, daß der Hauptkörper (1d) des weiteren mit wenigstens einer Nut (13) in der Einfallseite (11d) versehen ist, die eine Innenabmessung aufweist, welche nicht größer ist als die halbe Wellenlänge der elektromagnetischen Welle.
  7. Elektromagnetische Wellenverbreitungsstruktur nach Anspruch 1, dadurch gekennzeichnet, daß der Hauptkörper (1d) ferner mit mehreren Nuten (13) in der Einfallsseite (11d) versehen ist, von denen jede Nut (13) eine Innenabmessung aufweist, die nicht größer ist als die halbe Wellenlänge der elektromagnetischen Welle, und daß nebeneinander liegende dieser Nuten (13) in einem Abstand voneinander getrennt sind, der nicht größer ist als die Wellenlänge der elektromagnetischen Welle.
  8. Elektromagnetischen Wellenverbreitungsstruktur nach Anspruch 1, ferner gekennzeichnet durch eine lichtdurchlässige elektrische Schicht (3), die auf der Einfallseite (11) des Hauptkörpers (1) angeordnet ist.
  9. Elektromagnetische Wellenverbreitungsstruktur nach Anspruch 1, dadurch gekennzeichnet, daß jeder der Wellenverbreitungskanäle (2) durch eine Kanaloberfläche begrenzt wird, die aus einem Material gefertigt ist, das die Durchlässigkeit der elektromagnetischen Welle verstärkt.
  10. Elektromagnetische Wellenverbreitungsstruktur nach Anspruch 9, dadurch gekennzeichnet, daß die Kanaloberflächen der Wellenverbreitungskanäle (2) metallisch sind.
  11. Verfahren zur Fokussierung einer elektromagnetischen Welle, die sich von einem Wellen abgebenden Block in einer Wellenverbreitungs-Richtung (y) in einen Lichtspot an einem Wellenaufnahmeblock ausbreitet, gekennzeichnet durch die folgenden Schritte: Schaffen einer elektromagnetischen Wellenverbreitungsstruktur zwischen dem Wellen aussendenden Block und dem Wellen empfangenden Block, wobei die elektromagnetische Wellenverbreitungsstruktur einen Hauptkörper (1) aufweist, der Oberflächen besitzt, die die Verbreitung der elektromagnetischen Welle blockieren, und der eine Einfallseite (11) sowie eine Austrittsseite (12), die der Einfallseite (11) und der Wellenverbreitungs-Richtung (y) gegenüberliegt, besitzt, wobei der Hauptkörper (1) mit Wellenverbreitungskanälen (2) versehen ist, die getrennt nebeneinander liegen, und zwar in einem Abstand, der nicht größer ist als die Wellenlänge der elektromagnetischen Welle, wobei ferner jeder der Wellenverbreitungskanäle (2) sich von der Einfallseite (11) zu der Austrittsseite (12) erstreckt; und wobei ferner die elektromagnetische Welle, die sich von dem Wellen aussendenden Block durch die elektromagnetische Wellenverbreitungsstruktur, über die Wellenverbreitungskanäle (2) und in dieser erregende Oberflächenplasmawellen in Richtung auf den Wellenaufnahmeblock ausbreitet, in einem Lichtspot fokussiert wird, der eine Spotgröße hat, welche kleiner ist als die Hälfte der Wellenlänge der elektromagnetischen Welle, dadurch gekennzeichnet, daß genau zwei dieser Wellenverbreitungskanäle vorhanden sind, und daß jeder der Wellenverbreitungskanäle eine Innenabmessung aufweist, die nicht größer ist als die halbe Wellenlänge der elektromagnetischen Welle, und daß des weiteren der Hauptkörper (1e) in der Wellenverbreitungs-Richtung (y) eine zentrale Achse bildet, daß jeder Wellenverbreitungskanal (2e) auf der Einfallsseite (11) des Hauptkörpers (1 e) eine Einfallöffnung (21) aufweist, die eine Austrittsöffnung (22e) auf der Austrittsseite (12e) des Hauptkörpers (1e) und einen inneren Teil (22), der sich zwischen der Einfallöffnung und der Ausfallöffnung (22e) erstreckt und eine zentrale Linie bildet, die parallel zu der zentralen Achse läuft, eine innere Abmessung aufweist, die nicht größer ist als die Einfallöffnung (21), wobei ferner die Austrittsöffnung (22e) jedes der Wellenverbreitungskanäle (2e) um die zentrale Linie des entsprechenden der Wellenverbreitungskanäle (2e) asymmetrisch verläuft, und wobei des weiteren die Austrittsöffnung (22e) jedes der Wellenverbreitungskanäle (2e) erste und zweite Hälften um die zentrale Linie bildet, so daß die erste Hälfte in der Nähe der zentralen Achse des Hauptkörpers (1e) liegt, die zweite Hälfte von der zentralen Achse entfernt liegt und die erste Hälfte eine Abmessung aufweist, die größer ist als diejenige der zweiten Hälfte.
  12. Verfahren nach Anspruch 11, dadurch gekennzeichnet, daß der Hauptkörper (1e) der elektromagnetischen Wellenverbreitungsstruktur in der Wellenverbreitungs-Richtung (y) eine zentrale Achse bildet, daß jeder der Wellenverbreitungskanäle (2e) auf der Einfallsseite (11) des Hauptkörpers (1e) eine Eintrittsöffnung (21) hat und eine Austrittsöffnung (22e) auf der Austrittsseite (12e) des Hauptkörpers (1e) sowie einen inneren Teil (23), der sich zwischen der Einfallöffnung und der Ausfallöffnung (22e) erstreckt und eine zentrale Linie bildet, die zu der zentralen Achse parallel verläuft, wobei diese Austrittsöffnung eine innere Abmessung hat, die nicht größer ist als die Einfallöffnung (21) und die Austrittsöffnung (22e) jedes der Wellenverbreitungskanäle (2e) um die zentrale Linie des entsprechenden der Wellenverbreitungskanäle (2e) asymmetrisch liegt.
  13. Verfahren nach Anspruch 12, dadurch gekennzeichnet, daß die Austrittsöffnung (22e) jedes der Wellenverbreitungskanäle (2e) um die zentrale Linie erstehen und zweite Hälften aufweist, wobei die erste Hälfte in der Nähe der zentralen Achse des Hauptkörpers (1e) und die zweite Hälfte von der zentralen Achse entfernt liegen, und wobei die erste Hälfte eine Abmessung aufweist, die größer ist als diejenige der zweiten Hälfte.
  14. Verfahren nach Anspruch 12, dadurch gekennzeichnet, daß die Austrittsöffnungen (22f) der Wellenverbreitungskanäle (2f) miteinander in direkter räumlicher Verbindung stehen.
  15. Verfahren nach Anspruch 11, dadurch gekennzeichnet, daß der Hauptkörper (1) der elektromagnetischen Wellenverbreitungsstruktur in der Wellenverbreitungs-Richtung (y) eine zentrale Achse bildet, und daß jeder der Wellenverbreitungskanäle (2) eine zentrale Linie bildet, die sich von der Einfallsseite (11) zu der Austrittsseite (12) gegen die zentrale Achse erstreckt.
  16. Verfahren nach Anspruch 11, dadurch gekennzeichnet, daß der Hauptkörper (1a) der elektromagnetischen Wellenverbreitungsstruktur des weiteren mit wenigstens einer Nut (13) in der Austrittsseite (12a) versehen ist, die eine Innenabmessung aufweist, welche nicht größer ist als die halbe Wellenlänge der elektromagnetischen Welle und die von einem der Wellenverbreitungskanäle (2) in einem Abstand beabstandet ist, der nicht größer ist als die Wellenlänge der elektromagnetischen Welle.
  17. Verfahren nach Anspruch 11, dadurch gekennzeichnet, daß der Hauptkörper (1 c) der elektromagnetischen Wellenverbreitungsstruktur ferner mit mehreren Nuten (13) in der Austrittsseite (12c) versehen ist, daß jede der Nuten (13) eine Innenabmessung hat, die nicht größer ist als die halbe Wellenlänge der elektromagnetischen Welle, und daß benachbarte Nuten (13) in einer Entfernung mit Abstand nebeneinander liegen, die nicht größer ist als die Wellenlänge der elektromagnetischen Welle.
  18. Verfahren nach Anspruch 11, dadurch gekennzeichnet, daß der Hauptkörper (1d) der elektromagnetischen Wellenverbreitungsstruktur des weiteren mit wenigstens einer Nut (13) in der Einfallseite (11d) versehen ist, die eine innere Abmessung hat, welche nicht größer ist als die halbe Wellenlänge der elektromagnetischen Welle.
  19. Verfahren nach Anspruch 11, dadurch gekennzeichnet, daß der Hauptkörper (1d) der elektromagnetischen Wellenverbreitungsstruktur des weiteren mit mehreren Nuten (13) in der Einfallseite (11d) versehen ist, daß jede der Nuten (13) eine innere Abmessung hat, die nicht größer ist als die Hälfte der Wellenlänge der elektromagnetischen Welle, und daß benachbarte Nuten (13) in einem Abstand nebeneinander liegen, der nicht größer ist als die Wellenlänge der elektromagnetischen Welle.
  20. Verfahren nach Anspruch 11, dadurch gekennzeichnet, daß die elektromagnetische Wellenverbreitungsstruktur des weiteren eine lichtdurchlässige, dielektrische Schicht (3) aufweist, welche auf der Einfallseite (11) des Hauptkörpers (1) angeordnet ist.
  21. Lichtspot-Generator, gekennzeichnet durch einen Wellen aussendenden Block, von dem aus eine elektromagnetische Welle in einer Wellenverbreitungs-Richtung (y) verbreitet werden kann, sowie durch eine elektromagnetische Wellenverbreitungsstruktur gemäß Anspruch 1.
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